Why would you want to do this? Well, let’s say you sent a promotional email to 500 people with a link in it. Would you like to know how many people clicked that link? Let’s say 50 people clicked the link. A little later you send out another email with different copy in it but for the same promotion, let’s say that 100 people click the link this time … which of the 2 emails are you most likely to send out next time? Clearly the second email appears to be more effective but you would only know that by knowing how many people clicked it.READ MORE